main.c

STM32 demo板的例程

/******************** (C) COPYRIGHT 2007 STMicroelectronics ********************
* File Name          : main.c
* Author             : embest
* Date First Issued  : 08/29/2007
* Description        : Main program body
********************************************************************************
* History:
* 08/29/2007: Vers.1.1
********************************************************************************
* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_lib.h"

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
NVIC_InitTypeDef NVIC_InitStructure;
bool PreemptionOccured = FALSE; 
u8 PreemptionPriorityValue = 0; 
  
/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void EXTI_Configuration(void);
void Delay(vu32 nCount);
  
/* Private functions ---------------------------------------------------------*/
/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
int main(void)
{
#ifdef DEBUG
  debug();
#endif
  
  /* System Clocks Configuration */
  RCC_Configuration();
  
  /* Configure GPIOs */
  GPIO_Configuration();

  /* Configures the EXTI Lines */
  EXTI_Configuration();

       
#ifdef  VECT_TAB_RAM  
  /* Set the Vector Table base location at 0x20000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0); 
#else  /* VECT_TAB_FLASH  */
  /* Set the Vector Table base location at 0x08000000 */ 
  NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);   
#endif

  /* Configure one bit for preemption priority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
  
  /* Enable the EXTI0 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = PreemptionPriorityValue;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  /* Enable the EXTI9_5 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQChannel;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  
  /* Configure the SysTick Handler Priority: Preemption priority and subpriority */
  NVIC_SystemHandlerPriorityConfig(SystemHandler_SysTick, !PreemptionPriorityValue, 0);
  
  while (1)
  {
  //  if(PreemptionOccured != FALSE)
  //  {
      GPIO_WriteBit(GPIOB, GPIO_Pin_8, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_8)));
      Delay(0x2FFFF);
      GPIO_WriteBit(GPIOB, GPIO_Pin_9, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_9)));
      Delay(0x2FFFF);
      GPIO_WriteBit(GPIOB, GPIO_Pin_10, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_10)));
      Delay(0x2FFFF);
      GPIO_WriteBit(GPIOB, GPIO_Pin_11, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_11)));
      Delay(0x2FFFF); 
	  GPIO_WriteBit(GPIOB, GPIO_Pin_12, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_12)));
      Delay(0x2FFFF); 
	  GPIO_WriteBit(GPIOB, GPIO_Pin_13, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_13)));
      Delay(0x2FFFF); 
	  GPIO_WriteBit(GPIOB, GPIO_Pin_14, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_14)));
      Delay(0x2FFFF); 
	  GPIO_WriteBit(GPIOB, GPIO_Pin_15, (BitAction)(1 - GPIO_ReadOutputDataBit(GPIOB, GPIO_Pin_15)));
      Delay(0x2FFFF); 
  //  }
  }
}

/*******************************************************************************
* Function Name  : RCC_Configuration
* Description    : Configures the different system clocks.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void RCC_Configuration(void)
{
  /* RCC system reset(for debug purpose) */
  RCC_DeInit();

  /* Enable HSE */
  RCC_HSEConfig(RCC_HSE_ON);

  /* Wait till HSE is ready */
  while(RCC_GetFlagStatus(RCC_FLAG_HSERDY) == RESET)
  {
  }

  /* HCLK = SYSCLK */
  RCC_HCLKConfig(RCC_SYSCLK_Div1); 
  
  /* PCLK2 = HCLK */
  RCC_PCLK2Config(RCC_HCLK_Div1); 

  /* PCLK1 = HCLK */
  RCC_PCLK1Config(RCC_HCLK_Div1);

  /* Select HSE as system clock source */
  RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);

  /* Wait till HSE is used as system clock source */
  while(RCC_GetSYSCLKSource() != 0x04)
  {
  }

  /* Enable GPIOA, GPIOB, GPIOC and AFIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB
                         | RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
}


#ifdef  DEBUG
/*******************************************************************************
* Function Name  : assert_failed
* Description    : Reports the name of the source file and the source line number
*                  where the assert error has occurred.
* Input          : - file: pointer to the source file name
*                  - line: assert error line source number
* Output         : None
* Return         : None
*******************************************************************************/
void assert_failed(u8* file, u32 line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/*******************************************************************************
* Function Name  : GPIO_Configuration
* Description    : Configures the used GPIO pins.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Configure PC6, PC7, PC8 and PC9 as output push-pull */
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11|GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
  
  /* Configure GPIOA Pin0 as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  
  /* Configure GPIOB Pin9 as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
}

/*******************************************************************************
* Function Name  : EXTI_Configuration
* Description    : Configures the used EXTI lines.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void EXTI_Configuration(void)
{
  EXTI_InitTypeDef EXTI_InitStructure;

  /* Connect EXTI Line0 to PA.00 */
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
  
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
  
  /* Connect EXTI Line9 to PC.13 */
  GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource13);
  
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_Line = EXTI_Line9;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
}

/*******************************************************************************
* Function Name  : Delay
* Description    : Inserts a delay time.
* Input          : nCount: specifies the delay time length.
* Output         : None
* Return         : None
*******************************************************************************/
void Delay(vu32 nCount)
{
  for(; nCount!= 0;nCount--);
}

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/